末次冰期以来印尼穿越流出口处古海洋学记录及其意义

张鹏; 徐建; 杨策; 高莲凤; 张振国; 牛耀

doi:10.16562/j.cnki.0256-1492.2017.03.013

末次冰期以来印尼穿越流出口处古海洋学记录及其意义

1.
西北大学地质学系新生代地质与环境研究所, 西安 710069

2.
西北大学大陆动力学国家重点实验室, 西安 710069

3.
华北理工大学矿业工程学院，唐山 063009

4.
河南省有色金属地质矿产局第五地质大队，郑州 450016

基金项目:
国家自然科学基金面上项目“末次冰期以来印尼穿越流次表层流时空变迁及其古海洋学意义” (41576045);2015年度陕西省人力资源与保障厅留学人员科技活动项目择优资助优秀类(陕人社函[2015]1190号)

详细信息

作者简介: 张鹏(1987—), 男, 博士研究生, 主要从事海洋微体古生物学和古海洋学研究，E-mail: zp13@foxmail.com

通讯作者: 徐建(1977—), 男, 教授，主要从事古海洋学和第四纪地质学研究，E-mail: jx08@live.cn

中图分类号: P736.22

蔡秋蓉编辑

收稿日期: 2016-06-22

修回日期: 2016-09-06

刊出日期: 2017-06-28

PALEOCEANOGRAPHIC RECORDS OF INDONESIAN THROUGHFLOW AT ITS EXIT SINCE THE LAST GLACIAL AND THEIR SIGNIFICANCE

1.
Institute of Cenozoic Geology and Environment, Department of Geology, Northwest University Xi'an 710069

2.
State Key Laboratory of Continental Dynamics and Department of Geology, Northwest University, Xi'an 710069

3.
School of Mining Engineering, North China University of Science and Technology, Tangshan 063009

4.
The Fifth Geological Team, Henan Province Non-ferrous Metals Geological Mineral Resources Bureau, Zhengzhou 450016

More Information

Corresponding author: XU Jian, jx08@live.cn

Received Date: 22 June 2016

Revised Date: 06 September 2016

Publish Date: 28 June 2017

摘要

摘要:
印尼穿越流作为连接西太平洋和印度洋的唯一通道，调节着这两个大洋之间的热量和水汽的交换，继而在热带乃至全球气候变化中扮演着重要的角色。本文对来自于帝汶海内印尼穿越流出口处SO18460钻孔中浮游有孔虫Globigerinoides ruber和Pulleniatina obliquiloculata 壳体的Mg/Ca比值和氧同位素进行再分析，重建了末次冰期以来表层和温跃层海水温度、盐度以及温跃层深度的变化，并将其与区域古气候记录对比以探讨其意义。结果表明，末次冰期以来，SO18460孔的表层和温跃层海水盐度均与区域降雨量记录变化一致，显示降雨信号以海水盐度的形式通过水体混合由表层向温跃层的传输。自早全新世以来，SO18460孔的表层海水温度在28 ℃左右波动，可能是受西太平洋暖池的影响；同时，温跃层海水温度始终低于22 ℃可能指示厄尔尼诺-南方涛动处于类厄尔尼诺状态；而温跃层海水温度持续下降、温跃层深度持续变浅，一方面可能是对早全新世以来类厄尔尼诺事件频发的响应，另一方面也可能归因于热带辐合带的南向移动导致区域降雨增加、以及东亚冬季风驱使南海表层流的加强等因素对印尼穿越流表层流的抑制。冰期-间冰期尺度上，SO18460孔温跃层海水温度与北半球夏季太阳辐射量变化步幅一致，可能是北太平洋热带水借助棉兰老岛流在苏拉威西海混入印尼穿越流所致。
- 盐度 /
- 西太平洋暖池 /
- 厄尔尼诺-南方涛动 /
- 北太平洋热带水 /
- 印尼穿越流
Abstract:
The Indonesian Throughflow (ITF), sole conduit between the Pacific and Indian Oceans, plays an important role in regulating heat and fresh water budgets between the two oceans, and in controlling the tropical and global climate. In this study, we investigated records from the Core SO18460 that was drilled at the exit of the ITF into the Timor Sea to reexamine their significance in reflecting the ITF since the last glacial. Records of temperature and salinity of surface and subsurface seawaters, and depth of thermocline (DOT) were reconstructed from δ¹⁸O and Mg/Ca ratio of the planktonic foraminifera of Globigerinoides ruber and Pulleniatina obliquiloculata and were then compared with regional paleoclimatic indices. The results show that salinity of both surface and thermocline seawaters co-varied with regional precipitation over the last glacial cycle, likely indicating transmission of precipitation signal by means of seawater salinity from sea surface to thermocline through upper ocean mixing. Sea surface temperature at the coring site of Core SO18460 oscillated centering at 28 ℃, possibly under influence of the Western Pacific Warm Pool since the early Holocene. In contrast, thermcoline seawater temperature (TWT) was always below 22 ℃, probably indicating that El Niño-Southern Oscillation was located in El Niño-like episodes. Decline of TWT and shoal of DOT might be, on the one hand, in response to more frequent El Niño-like events; and on the other hand, resulted from depression of ITF surface flow caused by increased precipitation due to southward shift of the Intertropical Convergence Zone, and/or by intensification of South China Sea surface flow driven by enhanced East Asian winter monsoon during Holocene. On glacial-interglacial timescale, TWT co-varied with the boreal summer insolation, possibly due to influence of North Pacific Tropical Water sourced waters that were carried by the Mindanao Current to the Sulawesi Sea and merged into the ITF.
- Indonesian Throughflow /
- salinity /
- Western Pacific Warm Pool /
- El Niño-Southern Oscillation /
- North Pacific Tropical Water

HTML全文

图 1 SO18460钻孔站位及研究区主要洋流分布

Figure 1.

下载: 全尺寸图片幻灯片

图 2 研究区现代表层(a)、次表层(b)海水温度^[16]和盐度^[17]分布图

Figure 2.

下载: 全尺寸图片幻灯片

图 3 末次冰期以来帝汶海区SO18460孔^[9]与MD01-2378孔古海洋学记录^[19]、中国、佛洛瑞斯石笋氧同位素^{[25, 44, 45]}、卡里亚科盆地Ti元素统计^[41]、ENSO波动程度^[33]以及ENSO事件记录对比^{[30, 32]}

Figure 3.

下载: 全尺寸图片幻灯片

图 4 1982—2009年间SO18460站位处月平均次表层海水温度(112m)、表层(5m)和次表层(112m)海水间的温度梯度(ΔT)与南方涛动指数(Southern Ocean Index, SOI)对比

Figure 4.

下载: 全尺寸图片幻灯片

表 1 SO18460孔AMS ¹⁴C测年数据^[12]

Table 1. AMS ¹⁴C dates for Core SO18460^[12]

Lab code	深度/cm	¹⁴C年龄/aBP	日历年龄/aBP
KIA 30820	10	905±25	595±33
KIA 33791	100	5 170±35	5 604±24
KIA 30821	200	11 050 ±50	12677±49
KIA 33792	240	13 990±70	15 935±134
KIA 30822	320	18 370±100	21 469±177
KIA 30823	350	19 800±120	23 256±215
KIA 30824	390	21 810±140	25 847±235
KIA 30825	420	23 720±190	28 082±255

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